My McAfee Internet Security on my windows 8 detected 4 files that are known as Troja Horses. It seems that my antivirus can't remove these, so i dont know what to do. They have been isolated (i think), but it's still troubleing me if they are harmless to my pc. These viruses are called:

PUP-FEI!3d48A0EDA17C

PUP-FEI!2DB3DB0089B2

PUP-FEI!46F288122C53

Artemis!903C06F02D54

I have read a little beat about these, and from what I understood, my Antivirus will find a way to remove them after some time. Is that true?

Do i have to worry, or maybe there is some other way to find and remove these?

Three of those detections are (relatively) harmless : PUP = Potentially Unwanted Program. Best thing to do is check your list of installed programs, and/or your browser add-ons or extensions, for toolbars and suchlike that you've acquired accidentally as part of a software download. Usually you can uninstall them but if you have difficulty doing that Malwarebytes will often delete them - McAfee flags them but lets you keep them if you want them.

The fourth of those is an Artemis detection and the best thing to do there is create a separate post in the Artemis section HERE. Read the what-to-do document first - see HERE. Artemis is for new detections so we don't know what this is yet.

If they're detected they've been moved into quarantine to await your decision. Open Security Center and click on Navigation - scroll down to the Quarantined and Trusted Items section. Click to open. May as well check to see what's in each of the three sections - for the Quarantined PUP's you can Restore, Delete or send to McAfee.